measurements Christos Leonidopoulos Columbia – DØ “Snowmass Studies” June 25, 2001

Christos Leonidopoulos Mixing in the B system Since the t-diagram is the main contribution to the mixing    propagator        tcui iibis i ibis q m q VV mq VV,, * tc,u,i 22 * 1  We think we understand the mixing of B’s. A deviation from this simple diagram is a deviation from SM.

June 25, 2001Christos Leonidopoulos …Mixing in the B system If CP is a good symmetry in the B mixing… independent of CKM V ij elements ~5  (  30%) lattice QCD A measurement of one of ΔΓ, Δm is a SM prediction for the other

June 25, 2001Christos Leonidopoulos Experimental methods Fit of proper time distributions of untagged data samples: – large statistics – sensitivity ~ Fit of proper time distributions of CP eigenstates From the measurement of the BR of – reduced statistics – sensitivity ~

June 25, 2001Christos Leonidopoulos Measurements Assuming Without external constraints (expected within ±1%) PDG2001 LEP B-Oscillation Group (CDF not included) Phenomenology

June 25, 2001Christos Leonidopoulos Outlook Both expected to be measured by CDF and DØ (RunII) Phenomenology: hadronic uncertainties expected to be reduced (currently at 30%) Compare